读取xml文件

 1 package test;
 2 
 3 import org.dom4j.Document;
 4 import org.dom4j.Element;
 5 import org.dom4j.io.SAXReader;
 6 
 7 import java.util.HashMap;
 8 import java.util.List;
 9 import java.util.Map;
10 
11 /**
12  * @Create 16:16
13  */
14 public class ReadXml2 {
15     public static void main(String[] args) throws  Exception {
16         SAXReader saxReader = new SAXReader();
17         String str = "/test2";//从控制台输入,表示url-pattern的值
18         Document document = saxReader.read("src/web.xml");
19         Element rootElement = document.getRootElement();
20         List<Element> servletmappingElements = rootElement.elements("servlet-mapping");
21         List<Element> servletElements = rootElement.elements("servlet");
22 
23         Map mappingMap=new HashMap<>();
24         //map.put("/test1","aa”);  map.put("/test2","bb")
25         for (Element e1 : servletmappingElements) {
26             Element servletname = e1.element("servlet-name");
27             Element urlpattern = e1.element("url-pattern");
28             mappingMap.put(urlpattern.getText(),servletname.getText());
29         }
30         Map servetmap=new HashMap();  //map.put("aa","com.atguigu.Demo1");
31         for (Element e2 : servletElements) {
32             Element servletname = e2.element("servlet-name");
33             Element servletclass = e2.element("servlet-class");
34             servetmap.put(servletname.getText(),servletclass.getText());
35         }
36         //给定的条件
37         String url="/test2";
38         String servletname =(String) mappingMap.get(url);
39         Object o = servetmap.get(servletname);
40         System.out.println(o);
41 
42     }
43 }

web.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<web>
    <servlet>
        <servlet-name>aa</servlet-name>
        <servlet-class>com.atguigu.Demo1</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>aa</servlet-name>
        <url-pattern>/test1</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>bb</servlet-name>
        <servlet-class>com.atguigu.Demo2</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>bb</servlet-name>
        <url-pattern>/test2</url-pattern>
    </servlet-mapping>
</web>